Major refurbishment plus basement, West London

Major refurbishment and addition of basement, large detached house, West London

Major refurbishment plus basement, West London


Brief and Targets: Planning Targets of EcoHomes Very Good, 40% minimum for each of 3 Categories: Energy, Water, Materials.
Sustainability Initiatives:

Energy-critical data:

Floor area:

Main materials:

Walls: U-value= 0.26/0.28 450/225mm solid brick with 72.5mm Celotex PL4000 on battens.
Roof: U-value= 0.15 Re-roofed, membrane, 140mm insulation (k=0.022) above, 18mm ply, on 200mm timber joists, plasterboard
Floors: U-value=0.14 New basement, 300mm concrete, 100mm urethane insulation (k=min 0.022), 75mm screed.
Windows: U-value=1.60. New Timber double glazed; 16mm gap. Soft Low-E argon filled.
Doors: U-value=1.80. Replaced with new timber door
Psi-values: Default value of y=0.15
Insulation: Urethane insulation basement, Celotex PL4000, Kingspan on flat roof
Heating: Mains Gas Condensing Boiler system
Controls: Time and temperature zone control
Hot water: 2 x 300 litre units – Megaflow Eco or similar
Ventilation: Extract ventilation to kitchen, utility and bathrooms. Mechanical ventilation to underground rooms.
Cooling: Air conditioning from ASHP (Mitsubishi PQRY 600)
Renewables: None
Low E lighting: Min 75% to be lowE

Points of Interest:

Diligent approach to Considerate Constructors measures.
"I have worked with Abba on various projects over the last couple of years, they have always worked efficiently and the assessments provided have been accepted by the relevant local planning authorities. The assessments have assisted in me securing planning permission, which as a planning consultant, is what I require." - Town Planning Bureau

Sensible Energy Saving Tip

Hedges make great wildlife habitats and are an attractive alternative to walls or fences in the garden. Use traditional species such as hazel, hawthorn, blackthorn, holly, beech, spindle, privet and yew. These provide food, shelter and nesting sites for birds, as well as shelter for animals travelling between gardens such as frogs and hedgehogs. Buy online from BTCV at

New Build or Domestic Refurbishment? Call Abba Energy on 020 8208 8333 for expert advice on Sustainable Housing Design and Construction.